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Old 07-20-2013, 01:06 AM   #1
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Default Test equipment recommendations

Looking for an inexpensive tachometer to measure brushless motor speed. I have new twin Mossie and suspect the motors are not running at same rpm.

Also looking for an inexpensive voltmeter where I can check the wires.

Thanks,

Hawk
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Old 07-20-2013, 01:10 AM   #2
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Originally Posted by dahawk View Post
Looking for an inexpensive tachometer to measure brushless motor speed. I have new twin Mossie and suspect the motors are not running at same rpm.

Also looking for an inexpensive voltmeter where I can check the wires.

Thanks,

Hawk
Harbor freight tools for the volt meter on sale $4.99

http://www.harborfreight.com/7-funct...ter-92020.html


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Old 07-20-2013, 01:12 AM   #3
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Tach

http://www.hobbyking.com/hobbyking/s...dProduct=30936


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Old 07-20-2013, 01:14 AM   #4
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Thanks Chellie ! Love that Store. Can hang out there. The Mossie has these lights that are easy to burn out if you don't get the wiring right. Not well marked +/-

I saw Nitro had a micro tach. Headsup didn't have anything.
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Old 07-20-2013, 01:15 AM   #5
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Jeepers Thanks ! on the HK rec.
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Old 07-20-2013, 01:21 AM   #6
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Originally Posted by dahawk View Post
Thanks Chellie ! Love that Store. Can hang out there. The Mossie has these lights that are easy to burn out if you don't get the wiring right. Not well marked +/-

I saw Nitro had a micro tach. Headsup didn't have anything.
I love Harbour freight tools too I bought a glass beader there, love it, they have all kinds of Goodies with out breaking the bank, i bought a metal bender there too to make the landing gear with

Originally Posted by dahawk View Post
Jeepers Thanks ! on the HK rec.
No Problem just keep sending me Referrals LOL

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Old 07-20-2013, 02:58 AM   #7
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Originally Posted by dahawk View Post
Looking for an inexpensive tachometer to measure brushless motor speed. I have new twin Mossie and suspect the motors are not running at same rpm.

Also looking for an inexpensive voltmeter where I can check the wires.

Thanks,

Hawk
Yeah, I've got two or three of those HF meters. And have checked them against my two $350 Fluke 87V digital multimters. Those el-cheapo HF meters are quite adequate for use with our electric models. So, why have the $350 meters? I'd have no problems measuring a 440 VAC bus with the Fluke meter. Absolutely NOT with the el-cheapo meters!!!

Should you ever want to expand to a more expensive meter down the road, next time you're at Sears, check out their #82369 digital clamp on multimeter. This $55 meter can do all the stuff, including thermocouple temperature readings, volts, Ohms, and so on. Plus, it can measure the motor current by simply clamping its jaws around ONE of the battery wires. (No adapter connectors needed!) It's got two ranges, 0-40 amps, and 0-400 Amps, that will cover just about any electric model out there. I've got one, and it stays in my transmitter case.

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Old 07-20-2013, 04:56 AM   #8
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Thanks Denny !

I'm off to harbor freight tomorrow after flying. Will order the cheapo micro tach from HK, though there's not much I can do if the motors on the Mossie twin are out of whack with each other. Maybe just switch the Y connectors. A 5% delta probably isn't the end of the world. They're CR type.

I'm assuming there's going to be a problem before finding out if there really is a problem. That's why I want to test.

-Hawk
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Old 07-20-2013, 05:01 AM   #9
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Originally Posted by dahawk View Post
Thanks Denny !

I'm off to harbor freight tomorrow after flying. Will order the cheapo micro tach from HK, though there's not much I can do if the motors on the Mossie twin are out of whack with each other. Maybe just switch the Y connectors. A 5% delta probably isn't the end of the world. They're CR type.

I'm assuming there's going to be a problem before finding out if there really is a problem. That's why I want to test.

-Hawk
Yeah, forgot to include the Sears clamp on ammeter web page. Just a note, most clamp on meters are AC only, not usable for our stuff. The Craftsman meter is AC and DC for its ampere ranges.

http://www.sears.com/craftsman-digit...p-03482369000P

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Old 07-20-2013, 06:17 PM   #10
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Chellie / Denny,

Went to HF today. I love that place. Bought the Cen-tech multimeter and while I was there, bought a bunch of other stuff I probably don't need. Next up is the micro tach from HK. Thinking of how I can optimize shipment by including some other things I'll need eventually. Could use another RX I suppose.
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Old 08-13-2013, 05:21 PM   #11
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My Hobbico has proven to be accurate and bullet-proof for over 10yrs .. I use if extensively in motor testing (including for multi-blade impellers on EDF motors [with a bit of math!]), yet I think I have only replaced the batteries 3-4 times since 2003! http://www.helidirect.com/hobbico-di...ter-p-2215.hdx
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